Centering aligning device



May 21, 1940. F. TURRETTINI 2,201,935 7 CENTERING ALIGNING DEVICE Filed March 22, 1959 Patented May 21, 194.0

UNITED STATES PATENT OFFICE CENTERING ALIGNING DEVICE land Application March 22, 1939, Serial No. 263,566 In Switzerland April 4,1938

5 Claims.

This invention relates to centering aligning devices and more particularly a type of these devices permitting to verify that two not parallel, geometric axes are situated in the same plane.

A device realizing said requirements will be, very useful on machine tools, in particular on horizontal boring machines furnished with a vertically rotatable work table, for instance, where it is necessary before beginning the boring work to adjust the tool spindle accurately with respect to the vertical axis of rotation of the work table.

In this case the two geometric axes of the tool spindle and the work table, respectively, are positioned at a right angle. It is to be understood, however, that the principle of the present inven tion is by no means limited to this particular case, and that said two axes could form any angle between each other.

It is the object of the invention to provide a centering aligning device of the above mentioned type, wherein an angle bracket having two abuts ting surfaces and a measuring device with a feeler organ is adapted to be mounted on two mandrels, each of which is concentrically disposed to one of the above mentioned axes, so as to bear against one of these mandrels by means of one of said abutments, and against the other mandrel by means of the other abutment and the free end of said feeler organ.

The invention consists in the construction and arrangement of certain parts as will be apparent from the following description and claims, reference being had to the accompanying drawing which shows one embodiment of the invention.

Figure 1 shows an elevation view thereof, partially in section.

Figure 2 illustrates the way of using the device.

Figure 3 shows a modification of a detail.

The represented embodiment is applied to a boring machine not illustrated in the drawing but by its horizontal tool spindle which follows the axis A and by a work table B having a vertical axis C. The mandrel l concentric with the axis A is provided with a cylindrical fit portion :1, and concentrically with the axis C is located the mandrel l sitting with a tapered portion H in the pivot of the work table B and being furnished with two cylindrical fit portions 8 and 9. An angle bracket 2 carries two plane abutting surfaces 5 and 6 positioned in the same plane one below the other, and it presents at its lower part a comparator or dial indicator 3 fastened in a cheek and furnished with a feeler I. This bracket 2 is suspended on the mandrel I by means of the (Cl. 33-172A) backing surface 4 and the abutting surface 5 cooperating both with the fit portion is, whereby the bracket is maintained in this position by its own weight.

The diameters of the fit portions la, 8 and 9 are equal; this condition is easily practicable with great precision, as well as the rectilinearity and the concentricity of the mandrels l and III with their respective sockets, for instance the co-ncentricity of the fit portions 8 and 9 with the cone ll of the mandrel I 0.

When'using the device, at first a perfectly plane gauge H (see Fig, 2) fitting into the shape of the frame 2 anddetermining a plane of reference is applied on the abutting surfaces 5 and 6 of the bracket and bears also against the feeler 7. In this adjusting position the dial indicator 3 is set to zero for facilitating the following use of the device.

The bracket 2 is then placed on the horizontal mandrel I, so that the backing surface 4 and the abutting surface 5 are in contact with the fit portion a, abutting surface 6 with the fit portion 8, and the feeler l in contact with the fit portion 9. It maintains this position under the effect of its own weight. According to the indication of the comparator the relative position of the spindle and the table must be adjusted by moving one or the other in the direction of the arrows F1 or F2 until the comparator indicates again zero. At that moment the two geometric axes A and C are situated in the same plane. The distance between the feeler 1 and the abutting surface 6 could be greater than the distance between the two abutting surfaces 5 and 6 in order to amplify the relative displacements of the spindle and the table.

The backing surface 4, having no precise function, can be replaced by a rotatable roller 13 in view of a reduction of the friction (see Fig. 3).

The equality in diameter of the three fit portions la, 8 and 9 is not indispensable; it represents, however, the most suitable arrangement as it permits the convenient setting to zero of the indicator 3 by means of a plane gauge as explained above. The indicator could indeed also be disposed in another way than that shown in.

two not parallel geometric axes of two pieces are situated in the same plane, consisting of an angle bracket having two spaced plane abutting surfaces on the inner face of its long leg and a seat on its short leg, and of a comparator carried by the free end of the long leg and having a fecler extending perpendicularly to the planes of the abutting surfaces, said bracket being adapted to be placed by means of said seat and one of said abutting surfaces on the piece of one axis, and to cooperate by means of the other of said abutting surfaces and the feeler of said comparator with the piece of the other axis.

2. Centering aligning device according to claim 1, wherein the two spaced plane abutting surfaces are situated in the same p1ane,'the feeler of said comparator following after the abutting surfaces at a distance greater than the distance between said surfaces.

3. Centering aligning device according to claim 1, wherein the seat on the short leg of the bracket is constituted by a backing surface, said bracket being maintained in position on the piece of one of said axes by its own weight.

4. Centering aligning device according to claim. 1, wherein the seat on the short leg of the bracket is constituted by a rotatable roller fixed to said leg, said bracket being maintained in position on i the piece of one of said axes by its own weight.

5. Centering aligning device according to claim 1, the bracket being provided with a projection adapted to bear against that piece of an axis which cooperates with the feeler so as to fix the accurate position of said bracket relatively to said axis.

FERNAND TURRET'I'INI. 

